Super-long cast-in-place pile construction method for rapidly downwards putting steel reinforcement cage

Abstract

A super-long cast-in-place pile construction method for rapidly downwards putting a steel reinforcement cage comprises the steps that firstly, an empty hole (2) is drilled in the ground outside the pile position of a super-long cast-in-place pile through a pile machine (1), and then a steel tube (4) is put into the empty hole through a crawler crane (3); a steel reinforcement cage bottom cage (5) is put into the steel tube, then a steel reinforcement cage top cage (6) is hoisted to the position, above the steel reinforcement cage bottom cage, of an orifice of the steel tube, and the steel reinforcement cage bottom cage and the steel reinforcement cage top cage are welded into the integrated steel reinforcement cage (7) for stand-by; and then a pile hole (8) is drilled in the pile position of the super-long cast-in-place pile and finally the integrated steel reinforcement cage (7) is hoisted and downwards put into the pile hole (8). The problem that time for downwards putting the steel reinforcement cage is very long in traditional super-long cast-in-place pile construction is solved, and the difficult problems that a pressure bearing water head is located above the working face of the cast-in-place pile, a soft soil layer is thick and the thickness of sediment is difficult to control are solved.

Description

technical field [0001] The invention belongs to the technical field of building pile foundation construction methods, in particular to the construction method of super-long cast-in-place piles. Background technique [0002] In the construction of conventional ultra-long cast-in-situ piles, the reinforcement cage is lowered in sections in the pile hole, and arc welding is used at the hole to form a whole reinforcement cage, and then lowered into the pile hole. Due to the different numbers and diameters of the main bars of the reinforcement cage, the time required for butt jointing is different, and it takes 1 hour to several hours, which has a great impact on the project schedule. For projects where the head of the confined water is above the working face of the cast-in-situ pile, the soft soil layer is thick, and the thickness of the sediment is difficult to control, within a few hours of the butt joint of the steel bars, the phenomenon of mud dilution in the pile hole, hole...

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